Zoom lens system

G - Physics – 02 – B

Patent

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Details

G02B 15/20 (2006.01) G02B 15/173 (2006.01)

Patent

CA 2225969

A zoom lens system including a first lens group of a positive refractive power having two lenses which moves linearly toward an object for a magnification change; a second lens group of a negative refractive power at least having one lens of a negative refractive power and one lens of a positive refractive power cemented thereto; a third lens group of a positive refractive power which moves non-linearly toward the object for a magnification changes; and a fourth lens group of a negative refractive power which moves linearly toward the object for a magnification change.

Un objectif à focale variable comprenant un premier groupe de lentilles à réfringence positive ayant deux lentilles qui se déplacent de façon linéaire vers un objet pour un changement de grossissement; un deuxième groupe de lentilles à réfringence négative ayant au moins une lentille à réfringence négative et une lentille à réfringence positive qui y est collée; un troisième groupe de lentilles à réfringence positive qui se déplacent de façon non linéaire vers un objet pour un changement de grossissement; et un quatrième groupe de lentilles à réfringence négative qui se déplacent de façon linéaire vers un objet pour un changement de grossissement.

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